The 1-star threads are like watching a committee of blind men describing an elephant. Unsurprisingly, no one has the complete picture, but a lot of Canon owners think these cards are bogus. SD card technology is very complex, the Class system is often misunderstood, and there is a long history of compromised cards appearing on eBay -- or even from reputable dealers who have been hoodwinked. Kingston cards are most often faked (or taken from the midnight production run); that's because Kingston has about a third of the flash card market and doesn't forge their own chips, but any manufacturer can be spoofed. It doesn't pay to buy cheap cards on eBay or less reputable sources.
An SD card contains a controller chip and flash memory chips, even the microSD versions. Realize that SD means Secure Digital, and that security comes from crypto managed by the controller (MMC cards didn't have that bloat, but Hollywood DRM requirements made sure they faded.) The controller can be pretty powerful: the Samsung SD controller is a 32-bit ARM TDMI chip with 128 k of code space -- that's cell phone power. It handles I/O and fading (when the card slowly wears out its NAND sites after about 100,000 hits so writing is randomly distributed and kept track of), the factory self-test, and a host of other functions, but it can also be programmed to report a false storage capacity. Sometimes the firmware on the controller or its crypto or something else on certain cards leads to problems with certain hardware, as it has, for example, with the Samsung Galaxy III and maybe the Canon cameras. Usually the card is found to confirm to SDcard dot Org specifications and the hardware is to blame, but you never know.
To test the actual capacity of your card, use H2testw, which is free. It writes the full amount of data to the card and then reads it back (this nukes whatever was on the card). This can take more than an hour with a 32 GB card but it tells you if the card indeed holds 32 GB or has problems. It also gives you read and write speed numbers, but it's unclear whether the numbers are for random read/write, or sequential read/write. Sequential write is what photographers and videographers care most about.
Sometimes a Class 6 card might test faster than a Class 10 card, when using computer read/write tests or even in a camera that wasn't designed with higher capacity cards in mind. That's because they use smaller block sizes (there's no cache on an SD card). Explaining the significance of this is getting too far into the weeds for an Amazon review, and modern devices and their firmware should not have that limitation.
To test random and sequential read/write speed, use CrystalDiskMark, also free. Run the full suite; it won't take long. CrystalDiskMark requires that the card be formatted, and the most reliable way to do that is to use the free tool from sdcard dot org. A 32 GB card will may report 39.9 GB before formatting and 29.8 GB after; don't worry, you haven't been ripped off.
Unfortunately, there's no easy way to read the manufacturer's ID off the SD card, even in Linux, to determine who actually made the card, because you have to have it connected directly to a motherboard; an SD-to-USB adapter won't work because it doesn't pass through disk data, and that's what's in nearly all computers. But what do you care, so long as the card's as big and fast as claimed?
Now, what about the Transcend 32 GB SDHC C10 card? Here are full test results from CrystalDiskMark:
Transcend 32 GB SDHC C10
-----------------------------------------------------------------------
CrystalDiskMark 3.0.2 (C) 2007-2013 hiyohiyo
Crystal Dew World : [...]
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]
Sequential Read : 19.953 MB/s
Sequential Write : 13.786 MB/s
Random Read 512KB : 19.618 MB/s
Random Write 512KB : 13.827 MB/s
Random Read 4KB (QD=1) : 3.003 MB/s [ 733.2 IOPS]
Random Write 4KB (QD=1) : 1.414 MB/s [ 345.1 IOPS]
Random Read 4KB (QD=32) : 3.491 MB/s [ 852.3 IOPS]
Random Write 4KB (QD=32) : 1.842 MB/s [ 449.8 IOPS]
Test : 50 MB [F: 0.0% (0.0/29.3 GB)] (x5)
Date : 2013/05/12 18:19:47
So you can see that the sequential write speed, what matters to a photographer or videographer, is over 13 MB/s, more than 30% above the C10 spec. The other speeds aren't to shabby, either. There's no way that this card is too slow for a contemporary camera, still or video, that is functioning properly.
Also on Amazon for a very attractive price is a Sony 32 MB SD card. Here are the full CrystalDiskMark test results for it:
Sony 32 GB SDHS USH-I
Sequential Read : 19.998 MB/s
Sequential Write : 14.115 MB/s
Random Read 512KB : 19.772 MB/s
Random Write 512KB : 13.173 MB/s
Random Read 4KB (QD=1) : 3.682 MB/s [ 899.0 IOPS]
Random Write 4KB (QD=1) : 2.302 MB/s [ 561.9 IOPS]
Random Read 4KB (QD=32) : 4.517 MB/s [ 1102.8 IOPS]
Random Write 4KB (QD=32) : 2.323 MB/s [ 567.0 IOPS]
So the Sony is slightly faster, 40% over spec. H2testw also reported full capacity and no errors for this card, so they are both top notch (The Sony doesn't come with a little case and the case for the Transcend case is about twice as big as it needs to be and so won't fit in the little pockets in a modern camera bag. Big deals.)
Just for reference, here are the results for a contemporary USB thumb drive:
SanDisk Ultra 32 GB USB thumb drive
Sequential Read : 22.508 MB/s
Sequential Write : 7.985 MB/s
Random Read 512KB : 22.365 MB/s
Random Write 512KB : 1.767 MB/s
Random Read 4KB (QD=1) : 3.719 MB/s [ 908.1 IOPS]
Random Write 4KB (QD=1) : 0.520 MB/s [ 126.9 IOPS]
Random Read 4KB (QD=32) : 3.871 MB/s [ 945.0 IOPS]
Random Write 4KB (QD=32) : 0.482 MB/s [ 117.7 IOPS]
As you can see, this USB drive is faster than the SD cards for reading, such as playing music, running software, or looking up data, which shows that it is nicely optimized for its intended functions.
As an aside, anyone who thinks they have lost data on an SD card can recover pictures using the free tool at z-a-recovery or recover everything(!) with the free PhotoRec tools.
So, if people want to whine about these SD cards in their particular cameras, they should run these simple, free tests and reach their own conclusions about whether the cards are "too slow." The cards test above spec objectively. And they both work flawlessly on my still (not Canon) and video cameras. I think they have gotten a bad rap here from people who don't have the full picture, so to speak.
I'll also post this as a review, and on the Sony 32 GB page, too. I hope you found it informative.
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This item: Transcend 64GB SDXC Class 10 Flash Memory Card Up to 30MB/s (TS64GSDXC10)
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Product information
| Special Feature | water proof |
|---|---|
| Read Speed | 30 |
| Warranty Type | Lifetime |
| Hardware Interface | SDHC |
| Secure Digital Association Speed Class | Class 10 |
| Manufacturer | Transcend Information |
| UPC | 887545997701 885782165204 012304081289 880959945221 885782165259 634392937134 763616003925 806291854748 132017782423 778888339214 760557818380 |
| Global Trade Identification Number | 00778888339214, 00132017782423, 04052305275412 |
| Product Dimensions | 1.26 x 0.94 x 0.08 inches |
| Item Weight | 0.07 ounces |
| ASIN | B003P3Q0DU |
| Item model number | TS64GSDXC10 |
| Customer Reviews |
4.6 out of 5 stars |
| Best Sellers Rank | #857 in SecureDigital Memory Cards |
| Is Discontinued By Manufacturer | No |
| Date First Available | November 1, 2010 |
Warranty & Support
Product Warranty: For warranty information about this product, please click here
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From the manufacturer
Transcend Class 10 SDHC Flash Memory Card
TS64GSDXC10
Capture without limitation by pairing your digital camera and camcorder with Transcend's SDXC/SDHC Class 10 Cards. Designed with the photography enthusiasts and videographers in mind, Transcend's SDHC Class 10 Cards deliver high-speed performance at an affordable price.
What’s in the package?
SDXC/SDHC Class 10 memory card (64GB)
Features
- Ideal for digital camera and camcorder users
- Available in 8GB, 16GB, 32GB, 64GB, 128GB capacities
- Supports Ultra High Speed Class 1 specification (U1)
- Fully compliant with the SD 3.0 standard
Ideal for Full HD Video Recording
Fully Class 10 compliant, Transcend’s Premium SDXC/SDHC Class 10 Cards help improve camera response with ultra-fast read speeds of up to 30MB per second. This outstanding performance is ideal for capturing high-resolution photographs and flawless Full HD videos.
Note: Maximum transfer speed can only be achieved if the devices support UHS-I interface
Storage to Meet Your Needs
Transcend's SDXC/SDHC Class 10 Series memory cards come in a wide range of capacities from 8GB to 128GB to fit your storage needs. Whether you have a simple point and shoot or a high-end DSLR, they are the perfect everyday SDHC card to have during all occasions.
Excellent Compatibility & Post Production Efficiency
The versatile SDXC/SDHC Class 10 cards support the latest Class 10 compliant cameras and camcorders, and are also backward compatible with any devices below Class 10. To improve post production efficiency, maximize the transfer rate by pairing the SDHC card with Transcend's USB 3.0 RDF8 Card Reader to achieve a speed of up to 22MB/s.
RecoveRx software
With a purchase of Transcend’s SDXC/SDHC Class 10 memory cards, you can download our exclusive RecoveRx software for free. This user-friendly application allows you to conduct an in-depth search within your storage device for traces of erased files to be recovered.
Legal Disclaimers
(1) Storage capacity approximations are for general reference only. Actual results will vary depending on resolution, compression quality, video frame rate/interlace settings, and content. 1GB = 1 billion bytes. A certain portion of the storage capacity may be reserved for firmware and maintenance use. (2) Speed may vary depending on the device and usage of hardware or software. (3) SDXC/SDHC Class 10 cards are backwards compatible with SDXC/SDHC class 10 devices. (4) Available in Frustration-Free Packaging and/or regular retail package. (5) Please see Transcend website for additional warranty details and limitations.
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| Price | — no data | — no data |
| 8 Megapixals JPEG | Full HD | |
| 8GB | 1,920 photos | 120 minutes |
| 16GB | 3,840 photos | 240 minutes |
| 32GB | 7,680 photos | 480 minutes |
| 64GB | 15,360 photos | 960 minutes |
| 128GB | 30,720 photos | 1,920 minutes |
SDXC/SDHC UHS-II U3
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SDXC/SDHC UHS-I U3X
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SDXC/SDHC UHS-I U3
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SDXC/SDHC 10 UHS-I 600X
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SDXC/SDHC 10 UHS-I 400X
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SDXC/SDHC 10 UHS-I 200X
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326
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3,286
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12,204
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47,282
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| Price | — no data | — no data | — no data | $19.95 | — no data | $17.99 |
| Maximum Transfer Speeds | 285MB/s | 95MB/s | 95MB/s | 90MB/s | 60MB/s | 30MB/s |
| Capacity | 32GB - 64GB | 32GB - 64GB | 64GB - 256GB | 8GB – 128GB | 8GB – 64GB | 8GB – 128GB |
| Class | UHS-II U3 Class 10 | UHS-I U3 Class 10 | UHS-I U3 Class 10 | UHS-I U1 Class 10 | UHS-I U1 Class 10 | UHS-I U1 Class 10 |
| Video Recordings | 4K, Full HD, 3D | 4K, Full HD, 3D | 4K, Full HD, 3D | Full HD, 3D | Full HD | Full HD |
| Waterproof, Temperature Proof, Static Proof, X-ray Proof, Shock Proof | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
From the brand
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Transcend carries over 2000 products, including all types of memory modules, flash memory cards, USB flash drives, card readers, external hard drives, solid state drives and industrial-grade products, to satisfy virtually every possible memory-related requirement.
In addition to fulfilling system-specific needs, we create trends by developing daring new peripherals that accommodate modern high-tech lifestyles.
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This Item  Transcend 64GB SDXC Class 10 Flash Memory Card Up to 30MB/s (TS64GSDXC10) | Recommendations  |  |  |  |  | |
| Price | $12.79 | -29% $9.99 List: $13.99 | $8.77 | -15% $14.95 List: $17.49 | $12.79 | -13% $12.99 List: $14.99 |
| Delivery | Get it as soon as Friday, May 30 | Get it as soon as Friday, May 30 | Get it as soon as Friday, May 30 | Get it as soon as Friday, May 30 | Get it as soon as Friday, May 30 | Get it as soon as Tuesday, Jun 3 |
| Customer Ratings | ||||||
| Sold By | CONTINENTAL SUPPLY | CWP Online | CWP Online | Amazon.com | CONTINENTAL SUPPLY | eTECH |
| flash memory type | SDHC | SDXC | SDXC | SDXC | MLC | SDXC |
| memory capacity | 64 GB | 64 GB | 32 GB | 64 GB | 64 GB | 64 GB |
| speed class | class 10 | class 10 | class 10 | class 10 | class 10 | class 10 |
High Capacity, Low Price, Good Value, Slow w/ RAW Photos
I recently purchased a Canon Rebel T2i since I didn't need the relatively minor updates made in the T3i (at least not enough to justify the higher price). I wanted to get a few SDHC cards to test for performance purposes, since the T2i strongly recommends a class 6 or higher for optimum performance. Many have reported that less than class 6 will also slow down HD video recording, but that is specific to the T2i... If you understand SDHC card speeds and rating, skip ahead, otherwise, please read on... SDHC classes are used to define minimum read and write speeds. In my opinion, the write speed is much more important than the read speed since it allows your camera/video to process what you're doing and not slow down due to buffering or waiting for the card to write. SDHC Class 10 is defined as achieving a minimum r/w of 10MB/s (according to wikipedia: [...]. There does not appear to be a higher class than 10, at least according to wiki. A class 10 card is associated with a 66x rating. So class 10 = 66x "speed". (I'm not a major techie, so please correct me if this is not accurate... I generally rely on wikipedia for this stuff). This card is rated as a class 10, 133x speed (speed is noted on the package, not the card itself). For a card integrity and performance "simulation", I used H2testw with the Sandisk MicroMate SD / SDHC Memory Card Reader (Static Pack, New, SDDR-113) connected to a USB 2.0 port. The following are my test results: Warning: Only 15378 of 15379 MByte tested. Test finished without errors. You can now delete the test files *.h2w or verify them again. Writing speed: 15.9 MByte/s Reading speed: 17.1 MByte/s H2testw v1.4 The warning message can be disregarded due to the FAT file structure and the program cannot test the portion of the SDHC card that has basic file structure data. Photo Testing: (1) Raw + Large Superfine (5184x3456): On continuous shooting mode it shot at maximum speed for about 3-5 photos and then slowed considerably, taking a photo every 0.75-1.00 seconds (again, using the T2i). (2) Raw only (5184x3456): On continuous shooting mode it shot at maximum speed for 6 shots and then slowed down as noted in (1). (3) Large Superfine (5183x3456): It does not slow down after taking 32 continuous photos, but note that if your goal is to get raw photos, this may not be your best option if you need multiple bursts. Video Testing: Used HD 1920x1080 30fps and the video recorded for 2 minutes with no issues. Conclusion: The card exceeds the minimums for a Class 10 designation. However, it does not achieve the 133x (20MB/s) speeds that it claims. For most people, this should not be an issue. Check your device and do some research on the web to determine the appropriate memory card for your use. Overall, the 15.9MB/s vs. claimed 20Mb/s is not a deal breaker by any means to me, so I plan to keep the card and use it in this camera as a backup (using a 32GB card as a primary). I'll update this review if there are any performance and/or product issues.
Top reviews from the United States
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- Reviewed in the United States on May 13, 2013Capacity: 32GBStyle: Card OnlyPackage Type: Frustration-Free PackagingVerified Purchase
- Reviewed in the United States on April 11, 2010Capacity: 8GBStyle: Card OnlyPackage Type: Standard PackagingVerified Purchase
- Reviewed in the United States on May 19, 2025Capacity: 32GBStyle: Card OnlyPackage Type: Frustration-Free PackagingVerified Purchase
- Reviewed in the United States on May 17, 2025Capacity: 16GBStyle: Card OnlyPackage Type: Frustration-Free PackagingVerified Purchase
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Reviewed in the United States on May 22, 2025Capacity: 32GBStyle: Card OnlyPackage Type: Frustration-Free PackagingVerified Purchase
Top reviews from other countries
- Corinne, Ontario, CanadaReviewed in Canada on February 12, 2014
Transcend makes good stuff
Capacity: 32GBStyle: Card OnlyPackage Type: Frustration-Free PackagingVerified Purchase -
Stefano ContiReviewed in Italy on May 19, 2025
OTTIMO
Capacity: 32GBStyle: Card OnlyPackage Type: Standard PackagingVerified Purchase - WaleedReviewed in the United Arab Emirates on August 25, 2019
it's original and working good
Capacity: 128GBStyle: Card OnlyPackage Type: Standard PackagingVerified Purchase -
MariReviewed in Italy on September 22, 2020
Molto buono!
Ho acquistato questa sd per la mia reflex, molto buona!MariMolto buono!
Reviewed in Italy on September 22, 2020
Images in this review
- Narayan Rao GReviewed in India on December 2, 2016
Five Stars
Capacity: 8GBStyle: Card OnlyPackage Type: Standard PackagingVerified Purchase
